The installer I included only installs the basic gloves that overwrite each default color glove (my super powers only permit me to make simple batch files, nothing compared to most 'installers' found on this site). But if you want a little more pizazz, you totally can using NFSHtool. Download NFSHtool, check out the readme, and then you should be set to roll. With NFSHtool, you only need to swap out .bmp files that you want included in the .fsh file, which is then installed in the game. If you download the program and still can't figure it out, I guess I can write a brief little tutorial so people won't need to ask me how to do this anymore.
I'm still not sure which glove everyone thinks is cartoonish. I thought the original Easton glove I use to include was the most cartoony, but I've since replaced that with a red Nike in my installer that I think looks pretty sharp.
But regardless, you can totally put dirt on them if you'd like. As for directions on that, I have none. Looking briefly at Photoshop I don't really see a specific pattern that would provide a dirt effect, so I'm not sure how those other dirty modders were able to add it.
Anything to please my favorite online uncle! I'm glad to see that people are downloading and checking it out...